Based on unique characteristics of the inoculation messages (threat, involve- ment, and accessibility) and the special nature of the modality of word-of-mouth communicating along social networks, spreading inoculation is much more than a possibility; it is a likelihood.

Josh Compton & Michael Pfau

https://academic.oup.com/ct/article-abstract/19/1/9/4098704?redirectedFrom=fulltext

Although inoculation has established efficacy in conferring resistance to influence for those directly exposed to inoculation pretreatment messages, we argue that inoculation’s effects may extend beyond those directly exposed to others via word-of-mouth communication (WOMC) along social networks. Specifically, we argue that inoculation’s effects on attitude accessibility, involvement, and threat are particularly conducive to the spread of inoculation content, offering WOMC as a new inoculation modality.

Compton, J., & Pfau, M. (2009). Spreading inoculation: Inoculation, resistance to influence, and word-of-mouth communication. Communication Theory, 19, 9-28. https://doi.org/10.1111/j.1468-2885.2008.01330.x